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Strange quark
From Wikipedia, the free encyclopedia
(Redirected from Strange quarks)
| Strange Quark | |
| Composition: | Elementary particle |
|---|---|
| Family: | Fermion |
| Group: | Quark |
| Generation: | Second |
| Mass: | 80 - 130 MeV/c2 |
| Electric charge: | -1/3 e |
| Spin: | ½ |
The strange quark is a second-generation quark with a charge of -(1/3)e and a strangeness of −1. It is the third lightest quark after the up and down quarks, with a mass of somewhere between 80 and 130 MeV. The first strange particle (particle containing a strange valence quark) was discovered in 1947, with the identification of the kaon, but the strange quark itself was not identified until Gell-Mann and Zweig developed the quark model in 1964.
Hadrons containing strange valence quarks include the following:
- Kaons are mesons containing a strange quark (or its antiparticle) and an up or down quark.
- The η and η' flavorless mesons are linear combinations of several quark-antiquark pairs, including the strange-antistrange.
- The φ flavorless meson is pure strange-antistrange.
- Strange baryons are known as hyperons: the Σ and Λ have one strange quark, the Ξ two, and the Ω three.
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| Elementary particles | Fermions: Quarks: u · d · s · c · b · t • Leptons: e- · e+ · μ- · μ+ · τ- · τ+ · νe · νμ · ντ Bosons: Gauge bosons: γ · g · W± · Z0 Other: Ghosts |
| Composite particles | Hadrons: Baryons(list)/Hyperons/Nucleons: p · n · Δ · Λ · Σ · Ξ · Ω · Ξb • Mesons(list)/Quarkonia: π · K · ρ · J/ψ · Υ Other: Atomic nuclei • Atoms • Exotic atoms: Positronium • Molecules |
| Hypothetical elementary particles | Superpartners: Axino · Dilatino · Chargino · Gluino · Gravitino · Higgsino · Neutralino · Sfermion · Slepton · Squark Other: Axion · Dilaton · Goldstone boson · Graviton · Higgs boson · Tachyon · X · Y · W' · Z' |
| Hypothetical composite particles | Exotic hadrons: Exotic baryons: Pentaquark • Exotic mesons: Glueball · Tetraquark Other: Mesonic molecule |
| Quasiparticles | Davydov soliton · Exciton · Magnon · Phonon · Plasmon · Polariton · Polaron |
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